<template>
  <div>
    <!--上传-->
    <div class="uploadbox">
      <i class="el-icon-document"></i>{{uploadmsg}}
      <div class="img-btnbox">
        <div class="show">
          <div class="picture" :style="'backgroundImage:url('+headerImage+')'"></div>
        </div>
        <div class="showclick">
          <input type="file" id="upload" accept="image" @change="upload"  >
          <label for="upload"></label>
        </div>
      </div>
    </div>
    <!--列表-->
    <div class="uploadlist">
      <ul>
        <li v-for='item of FileDatalist' :unid="item.unid" :path="item.fullPath">
          <label>{{item.fullFileName}}</label>
          <span>
              <el-button type="primary" icon="search" class="c_f"  size="mini" @click="imgview(item.fullPath)">查看</el-button>
              <el-button type="primary" icon="delete2"class="c_f" size="mini" @click="deletefile(item.unid)"   v-show="no">删除</el-button>
          </span>
        </li>
      </ul>
      <mt-popup v-model="popupVisible" modal=false class="mint-popup-2">
        <img src='' id="imgInit">
      </mt-popup>
    </div>
  
  </div>
</template>
  
<script>
  import Exif from 'exif-js';
  import {
    UploadSingleFile
  } from '@/api/api';
  import {
    FileData
  } from '@/api/api';
  import {
    DeleteFile
  } from '@/api/api';
  
  import {
    Popup
  } from 'mint-ui';
  export default {
    name: "upload",
    components: {
      'mt-popup': Popup,
    },
    data() {
      return {
        uploadmsg:'', //上传购票票据，食品合格证明文件
        popupVisible: false,
        FileDatalist: '',
        headerImage: '',
        picValue: '',
        no: true,
        upbtn:true
      }
    },
    props: ['getuniddata', 'UserUnid', 'AliasData', 'AliasDataSort', 'uploadmsg', 'no','upbtn'],
  
    methods: {
      upload(e) {
        let files = e.target.files || e.dataTransfer.files;
        if (!files.length) return;
        this.picValue = files[0];
        this.imgPreview(this.picValue);
      },
      imgPreview(file) {
        let self = this;
        let Orientation;
        //去获取拍照时的信息，解决拍出来的照片旋转问题  
        Exif.getData(file, function() {
          Orientation = Exif.getTag(this, 'Orientation');
        });
        // 看支持不支持FileReader  
        if (!file || !window.FileReader) return;
  
        if (/^image/.test(file.type)) {
          // 创建一个reader  
          let reader = new FileReader();
          // 将图片2将转成 base64 格式  
          reader.readAsDataURL(file);
          // 读取成功后的回调  
          reader.onloadend = function() {
            let result = this.result;
            let img = new Image();
            img.src = result;
            //判断图片是否大于100K,是就直接上传，反之压缩图片  
            if (this.result.length <= (100 * 1024)) {
              self.headerImage = this.result;
              self.postImg();
            } else {
              img.onload = function() {
                let data = self.compress(img, Orientation);
                self.headerImage = data;
                self.postImg();
              }
            }
          }
        }
      },
      postImg() {
        //上传图片
        let filecontent = this.headerImage.split('base64,')[1]
        let paramFile = {
          MainDataUnid: this.getuniddata,
          UserUnid: this.UserUnid,
          FileContent: filecontent,
          InFileName: this.picValue.name,
          AliasData: '',
          AliasDataSort: '',
        }
        UploadSingleFile(paramFile).then((res) => {
          if (res.success === true) {
            this.getfilelist();
          }
        })
      },
  
      getfilelist() {
        let FileDataparam = {
          params: {
            MainDataUnid: this.getuniddata, //"45958c55136646d099965da7b9001853"
            PageSize: 100,
            CurrentPage: 1
          }
        }
        FileData(FileDataparam).then((res) => {
          if (res.success === true) {
            this.FileDatalist = res.data;
          }
        })
      },
  
      rotateImg(img, direction, canvas) {
        //最小与最大旋转方向，图片旋转4次后回到原方向      
        const min_step = 0;
        const max_step = 3;
        if (img == null) return;
        //img的高度和宽度不能在img元素隐藏后获取，否则会出错      
        let height = img.height;
        let width = img.width;
        let step = 2;
        if (step == null) {
          step = min_step;
        }
        if (direction == 'right') {
          step++;
          //旋转到原位置，即超过最大值      
          step > max_step && (step = min_step);
        } else {
          step--;
          step < min_step && (step = max_step);
        }
        //旋转角度以弧度值为参数      
        let degree = step * 90 * Math.PI / 180;
        let ctx = canvas.getContext('2d');
        switch (step) {
          case 0:
            canvas.width = width;
            canvas.height = height;
            ctx.drawImage(img, 0, 0);
            break;
          case 1:
            canvas.width = height;
            canvas.height = width;
            ctx.rotate(degree);
            ctx.drawImage(img, 0, -height);
            break;
          case 2:
            canvas.width = width;
            canvas.height = height;
            ctx.rotate(degree);
            ctx.drawImage(img, -width, -height);
            break;
          case 3:
            canvas.width = height;
            canvas.height = width;
            ctx.rotate(degree);
            ctx.drawImage(img, -width, 0);
            break;
        }
      },
      compress(img, Orientation) {
        let canvas = document.createElement("canvas");
        let ctx = canvas.getContext('2d');
        //瓦片canvas  
        let tCanvas = document.createElement("canvas");
        let tctx = tCanvas.getContext("2d");
        let initSize = img.src.length;
        let width = img.width;
        let height = img.height;
        //如果图片大于四百万像素，计算压缩比并将大小压至400万以下  
        let ratio;
        if ((ratio = width * height / 4000000) > 1) {
          console.log("大于400万像素")
          ratio = Math.sqrt(ratio);
          width /= ratio;
          height /= ratio;
        } else {
          ratio = 1;
        }
        canvas.width = width;
        canvas.height = height;
        //        铺底色  
        ctx.fillStyle = "#fff";
        ctx.fillRect(0, 0, canvas.width, canvas.height);
        //如果图片像素大于100万则使用瓦片绘制  
        let count;
        if ((count = width * height / 1000000) > 1) {
          console.log("超过100W像素");
          count = ~~(Math.sqrt(count) + 1); //计算要分成多少块瓦片  
          //            计算每块瓦片的宽和高  
          let nw = ~~(width / count);
          let nh = ~~(height / count);
          tCanvas.width = nw;
          tCanvas.height = nh;
          for (let i = 0; i < count; i++) {
            for (let j = 0; j < count; j++) {
              tctx.drawImage(img, i * nw * ratio, j * nh * ratio, nw * ratio, nh * ratio, 0, 0, nw, nh);
              ctx.drawImage(tCanvas, i * nw, j * nh, nw, nh);
            }
          }
        } else {
          ctx.drawImage(img, 0, 0, width, height);
        }
        //修复ios上传图片的时候 被旋转的问题  
        if (Orientation != "" && Orientation != 1) {
          switch (Orientation) {
            case 6: //需要顺时针（向左）90度旋转  
              this.rotateImg(img, 'left', canvas);
              break;
            case 8: //需要逆时针（向右）90度旋转  
              this.rotateImg(img, 'right', canvas);
              break;
            case 3: //需要180度旋转  
              this.rotateImg(img, 'right', canvas); //转两次  
              this.rotateImg(img, 'right', canvas);
              break;
          }
        }
        //进行最小压缩  
        let ndata = canvas.toDataURL('image/jpeg', 0.1);
        console.log('压缩前：' + initSize);
        console.log('压缩后：' + ndata.length);
        console.log('压缩率：' + ~~(100 * (initSize - ndata.length) / initSize) + "%");
        tCanvas.width = tCanvas.height = canvas.width = canvas.height = 0;
        return ndata;
      },
  
      imgview: function(path) {
        this.popupVisible = true
        var  adres = "http://psnffs.com/" + path;
        document.getElementById('imgInit').src  =  adres;
      },
      //删除
      deletefile: function(unid) {
        let FileDataparam = {
          params: {
            unids: unid
          }
        }
        DeleteFile(FileDataparam).then((res) => {
          if (res.success === true) {
            this.getfilelist()
          }
        })
      }
    },
    mounted() {
      this.getfilelist();
    }
  
  }
</script>
  
<style lang="scss">
  .uploadbox {
    position: relative;
    margin: 20px 0px 10px;
    padding-left: 10px
  }
  
  .img-btnbox {
    position: absolute;
    right: 10px;
    top: -5px;
    width: 25px;
    height: 25px;
    overflow: hidden;
  }
  
  .uploadlist {
    width: 100%;
    ul {
      padding: 10px;
      li {
        margin-bottom: 10px;
        overflow: hidden;
        span {
          float: right;
        }
        label {
          vertical-align: -webkit-baseline-middle;
          vertical-align: baseline-middle;
        }
      }
    }
  }
  
  .showclick {
    position: relative;
    cursor: pointer;
    color: #888;
    background: url("../img/add.png") no-repeat;
    background-size: contain;
    display: inline-block;
    *display: inline;
    *zoom: 1;
    input {
      opacity: 0;
      filter: alpha(opacity=0);
      cursor: pointer;
      width: 35px;
      height: 100%;
    }
  }
  
  .el-radio__label {
    margin-top: 2px;
  }
  
  .disabled {
    display: none
  }
  
  //重构
  .items-text {
    p {
      margin: 0em !important;
      padding: 0em !important;
      line-height: 20px;
    }
  }
  
  .el-button {
    i {
      vertical-align: sub;
    }
  }
</style>